Percent_repeat_engraver in ChordNames context - double bar repeats?

[Robert Schmaus]

Dear Lilypond community,

I have successfully used the Percent_repeat_engraver in a chordnames 
context if the "\repeat percent" argument consists of a single bar , e.g.

changes = \chordmode{
  \repeat percent 4 { g1 : maj7 }
}

\score{
        \new ChordNames \changes
}
\layout{
        \context { \ChordNames \consists "Percent_repeat_engraver" }  
}


works fine.

However, using a two-bar chord pattern doesn't print the two-bar percent 
symbol, i.e.

changes = \chordmode{
  \repeat percent 4 { g1 : maj7 | d1 : min7  }
}

\score{
        \new ChordNames \changes
}
\layout{
        \context { \ChordNames \consists "Percent_repeat_engraver" }  
}

doesn't work.

Is this intentional?

Cheers,
Robert